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Note 5 - Fair Value Measurements (Detail) - The Carrying Amounts and Estimated Fair Values of the Company’s Financial Instruments (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Assets        
Cash and cash equivalents $ 110,218 $ 94,309 $ 101,402 $ 182,056
Held to maturity investment securities 875 875    
Loans, net 993,167 1,043,844    
Liabilities        
Deposits 1,403,991 1,435,065    
Federal funds purchased and other short-term borrowings 25,740 27,022    
Securities sold under agreements to repurchase and other long-term borrowings 180,380 190,694    
Subordinated notes payable to unconsolidated trusts 48,970 48,970    
Carrying (Reported) Amount, Fair Value Disclosure [Member]
       
Assets        
Cash and cash equivalents 110,218 94,309    
Held to maturity investment securities 875 875    
Loans, net 993,167 1,043,844    
Accrued interest receivable 5,905 6,619    
Liabilities        
Deposits 1,403,991 1,435,065    
Federal funds purchased and other short-term borrowings 25,740 27,022    
Securities sold under agreements to repurchase and other long-term borrowings 180,380 190,694    
Subordinated notes payable to unconsolidated trusts 48,970 48,970    
Accrued interest payable 2,044 2,375    
Estimate of Fair Value, Fair Value Disclosure [Member]
       
Assets        
Cash and cash equivalents 110,218 94,309    
Held to maturity investment securities 1,008 974    
Loans, net 990,603 1,043,824    
Accrued interest receivable 5,905 6,619    
Liabilities        
Deposits 1,408,221 1,441,490    
Federal funds purchased and other short-term borrowings 25,740 27,022    
Securities sold under agreements to repurchase and other long-term borrowings 201,360 212,176    
Subordinated notes payable to unconsolidated trusts 20,324 20,982    
Accrued interest payable 2,044 2,375    
Fair Value, Inputs, Level 1 [Member]
       
Assets        
Cash and cash equivalents 110,218 94,309    
Liabilities        
Deposits 840,842 787,396    
Fair Value, Inputs, Level 2 [Member]
       
Assets        
Held to maturity investment securities 1,008 974    
Accrued interest receivable 5,905 6,619    
Liabilities        
Federal funds purchased and other short-term borrowings 25,740 27,022    
Securities sold under agreements to repurchase and other long-term borrowings 201,360 212,176    
Accrued interest payable 2,044 2,375    
Fair Value, Inputs, Level 3 [Member]
       
Assets        
Loans, net 990,603 1,043,824    
Liabilities        
Deposits 567,379 654,094    
Subordinated notes payable to unconsolidated trusts $ 20,324 $ 20,982